It's too bad someone can't be in there and watch her with attention to language - I bet she is trying to communicate at times.
If we compare verbal to physical violence we may find the same patterns. Pryxs is brilliant, but a linear thinker. There are a number of ways that over stimulation from internal or external sources can cause a violent outburst. Autistic people are so inwardly oriented that when they have such behaviors I always look for the message.
I suspect that you are more fluent in your daughter's language than the folks at school.